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lly10092006
2 năm trước
quãng đường từ thị trấn tân kỳ đến thành phố vinh dài 100km. lúc 7 giờ 45 phút một ô tô đi từ thành phố vinh đến tấn kỳ, cùng lúc đó một xe máy đi từ tân kỳ đến thành phố vinh . hai xe gặp nhau lúc 8 giờ 45 phút . tính tổng vận tốc hai xe. tính vận tốc của mỗi xe biết vận tốc của xe máy bằng 2/3 vận tốc của ô tô. làm giúp mik nha mik cảm ơn
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